Crash View

M4 eastbound lane 1 and 2 closure (73/3 to 69/1) and lane 1 on Jct 12 entry slip

Cleared

M4 eastbound lane 1 and 2 closure (73/3 to 69/1) and lane 1 on Jct 12 entry slip

Start time
Thu, May 21, 2026 6:48 PM
Expected end
Fri, May 22, 2026 5:00 AM
Duration
10 hours 12 minutes
Road
M4 – M4 Eastbound Between J12 And J11
Category
Road Maintenance
Direction
Eastbound
Carriageway
Dual Carriageway
Lanes affected
2 of 2 lanes affected, 1 of 1 lanes affected
Reason
Maintenance Work
Live incident
Active roadworks
Planned
Cleared
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First published
Thu, May 21, 2026 6:48 PM
Last updated
Thu, May 21, 2026 11:03 PM
Cleared
Fri, May 22, 2026 5:00 AM
  • Latest update: M4 eastbound lane 1 and 2 closure (73/3 to 69/1) and lane 1 on Jct 12 entry slip
Coordinates
51.429118, -1.042578
Latitude span
51.421133 – 51.439132
Longitude span
-1.064393 – -1.016604
Bounding box centre
51.430133, -1.040499
Location descriptions
  • M4 eastbound between J12 and J11
  • M4 eastbound at the Reading services between J12 and J11
  • M4 J12 eastbound access
Feed validity status
Active
Overall feed start
Thu, May 21, 2026 6:48 PM
Overall feed end
Fri, May 22, 2026 5:00 AM
Feed window length
10 hours 12 minutes
Probability code (raw)
certain
Compliance option (raw)
mandatory
Source identification (raw)
roadworks
Management type value
other
Contra-flow flag (raw)
false
Width restriction flag (raw)
false
Height restriction flag (raw)
false
Weight restriction flag (raw)
false

Segment 1

5 coordinate pairs
Description
M4 eastbound between J12 and J11
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start1 End2
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{8DBDCBE3-BAE0-D27F-1EEE-60FCDFDD7D12}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
253 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.436749 -1.059924
51.436427 -1.059068
51.436289 -1.058735
51.435996 -1.058026
51.435488 -1.056897

Segment 2

4 coordinate pairs
Description
M4 eastbound between J12 and J11
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start1 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{3A8E025A-8D19-4F25-9A1D-2444574CDDD0}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
188 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.423372 -1.030543
51.42333 -1.03038
51.423306 -1.030295
51.422783 -1.028009

Segment 3

8 coordinate pairs
Description
M4 eastbound between J12 and J11
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start2 End2
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{A0668A72-3172-45AC-A78C-4A67B436001D}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
396 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.435488 -1.056897
51.435419 -1.056743
51.435186 -1.056243
51.435035 -1.055917
51.435007 -1.05586
51.434185 -1.054165
51.433728 -1.053254
51.433281 -1.052415

Segment 4

17 coordinate pairs
Description
M4 eastbound between J12 and J11
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start1 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{14B0352D-F889-48D8-9C8F-DADDD9A46BE3}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
815 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.422783 -1.028009
51.422713 -1.027667
51.422435 -1.026299
51.422386 -1.026021
51.422146 -1.024668
51.421939 -1.023414
51.421922 -1.023281
51.421807 -1.022405
51.421803 -1.022377
51.421601 -1.020828
51.421471 -1.019824
51.421418 -1.019422
51.421385 -1.019117
51.421272 -1.018088
51.421213 -1.017442
51.421198 -1.017282
51.421133 -1.016604

Segment 5

6 coordinate pairs
Description
M4 eastbound at the Reading services between J12 and J11
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start1 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{2E1D4CA3-A2F3-4B27-B35C-B07CE796AED7}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
323 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.424572 -1.034771
51.424041 -1.03306
51.423815 -1.032284
51.423375 -1.030555
51.423373 -1.030549
51.423372 -1.030543

Segment 6

4 coordinate pairs
Description
M4 J12 eastbound access
Lanes Restricted
1 lane restricted
Operational Lanes
1 operational lane
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start1 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{27BB9035-406D-46FD-A3C7-B0AE41D6BBBA}
Linear Element Type
B Carriageway Entry Slip
From Distance
0 m
To Distance
153 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.43755 -1.061715
51.43737 -1.061304
51.437072 -1.060621
51.436749 -1.059924

Segment 7

9 coordinate pairs
Description
M4 J12 eastbound access
Lanes Restricted
1 lane restricted
Operational Lanes
1 operational lane
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start1 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{F0DCC531-EBDA-63C5-5DD7-2D8518D6347A}
Linear Element Type
B Carriageway Entry Slip
From Distance
13 m
To Distance
273 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.439132 -1.064393
51.439095 -1.064379
51.43896 -1.06431
51.438914 -1.064268
51.438833 -1.064183
51.43876 -1.064055
51.438112 -1.062817
51.437678 -1.062008
51.43755 -1.061715

Segment 8

26 coordinate pairs
Description
M4 eastbound between J12 and J11
Carriageway
Dual Carriageway
Lanes Restricted
2 lanes restricted
Operational Lanes
2 operational lanes
Direction On Section
East Bound
Direction Relative
Aligned
Height Grade
Start2 End1
Linear Element Road
M4
Linear Element Model
The Network Model
Linear Element Id
{D2FD8BCC-65D0-40B9-A11F-6FFDC46BEB94}
Linear Element Type
B Carriageway
From Distance
0 m
To Distance
1,570 m
Gml Srs Name
EPSG::4326
Gml Srs Dimension
2
Raw coordinate list 
51.433281 -1.052415
51.43328 -1.052414
51.433034 -1.051944
51.432742 -1.051404
51.432194 -1.050451
51.431638 -1.049528
51.431097 -1.048676
51.430591 -1.047881
51.429999 -1.046929
51.429707 -1.046461
51.429424 -1.045978
51.428813 -1.044854
51.4281 -1.043502
51.427753 -1.04279
51.42735 -1.04195
51.427047 -1.04128
51.426783 -1.040696
51.426223 -1.039356
51.425969 -1.038714
51.425755 -1.038172
51.425589 -1.037715
51.425046 -1.036173
51.424926 -1.03583
51.424678 -1.035088
51.424678 -1.035088
51.424572 -1.034771
Geometry type
MultiLineString
Geometry points
79
First coordinate pair
-1.059924, 51.436749
Road section segments
1
Road section points
79
View geometry JSON 
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View road section coordinates 
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Cause type
Road Maintenance
Detailed cause
Maintenance Work
Compliance
Mandatory
Probability
Certain
Validity status
Active
Road management
Other
Feed provider
National Highways
Data source
Roadworks
Feed version
1
Record created
Thu, May 21, 2026 6:48 PM
Record versioned
Thu, May 21, 2026 11:03 PM
Coordinate source
Geometry

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